QEM Maps Idaho Tungsten Targets at Past-Producing Big It

QEM Limited (ASX: QEM) said it completed a review of historical geological, mining and exploration data at its Big It tungsten project in northern Idaho, a past producer of concentrates grading 67-75% WO3 with historical underground samples up to 2,980 ppm tungsten, 19.5% antimony and 11.15 g/t gold.

QEM Limited (ASX: QEM) has finished pulling together the paper trail on a mine that stopped producing generations ago, and says the result is a list of exploration targets it can test relatively cheaply. The Australian-listed critical minerals explorer said it has completed a detailed review and compilation of available historical geological, mining and exploration information for the Big It Project in northern Idaho, the asset it acquired earlier and is now working up for a first modern exploration campaign.

Big It is not a greenfield discovery story. It is a past producer of high-grade tungsten concentrates grading 67-75% WO3 — tungsten trioxide, the form in which tungsten grade is conventionally reported — that were shipped into United States wartime programmes. That history matters for two reasons: it establishes that a saleable product was once made on site, and it means much of the early geological work was done and documented by government geologists rather than by a junior explorer burning shareholder cash.

What the historical records actually show

QEM describes Big It as a demonstrated tungsten-antimony-gold (W-Sb-Au) polymetallic system sitting within the Pritchard Formation, a stratigraphic and structural setting the company calls highly prospective. Historical underground sampling returned individual values of up to 2,980 ppm tungsten, 19.5% antimony and 11.15 g/t gold, according to the company's compilation.

Those are individual sample results from old underground workings, not a resource estimate, and they should be read that way. A single channel or grab sample tells you a high-grade structure was intersected at that point; it says nothing yet about continuity, width or tonnage. What the numbers do establish is a metal endowment worth spending money to chase — and in the case of antimony and tungsten together, two metals that both sit on US critical minerals lists.

The more consequential line in the company's announcement is about geometry rather than grade. QEM says historical US Government exploration confirmed additional, multiple high-grade tungsten oreshoots, and that the project retains untested depth and strike potential. In an underground vein system, oreshoots are the discrete high-grade pods within a broader structure; multiple confirmed shoots suggest the historical miners took the accessible ones and left the rest untested below and along strike.

Why old workings change the cost equation

Extensive historical underground development is the part of the story a market focused on grade headlines tends to undervalue. Existing adits and drives give an explorer physical access to mineralisation without first paying to build it, which QEM frames as a clear, cost-effective pathway to test and expand the historical mineralised system.

For a small-cap explorer, that access is the difference between a program dominated by surface drilling from a standing start and one that can sample, map and drill from underground positions already cut. It typically shortens the loop between spending money and getting an answer. It also comes with obligations that shareholders should watch for in future disclosure: old workings need rehabilitation, ventilation and safety assessment before anyone works in them, and permitting on a historical site in Idaho is its own timeline. The company has not put a budget or a schedule on the next phase in this announcement, and readers should not assume one.

Tungsten's supply problem is the reason anyone is looking

QEM notes that tungsten prices remain elevated and that China still commands more than 80% of global supply, with demand rising across multiple industries. That single concentration figure explains most of the current Western interest in tungsten projects, however marginal they looked a decade ago.

Tungsten is the hardest of the industrial metals to substitute in its main uses — cemented carbide cutting tools, mining and drilling bits, and defence applications including armour and penetrators. There is no chemistry swap available the way there is between battery cathode formulations. When one country holds more than four-fifths of supply of a metal with no easy replacement, every downstream manufacturer in the US, Europe, Japan and Korea carries the same single-point risk, and governments have started treating that as a procurement problem rather than a market one.

The antimony credit at Big It compounds the point. Antimony is used in flame retardants, ammunition primers and increasingly in energy storage chemistry, and it has been subject to the same concentration dynamics as tungsten. A project with both, on US soil, in a jurisdiction with mining history, is exactly the profile American critical-minerals policy has been written to encourage. The details of QEM's compilation were released through INN Battery Metals.

What has to happen next

A desktop compilation is the cheapest step in exploration and the least conclusive. The value of it is that it converts a century of scattered government reports, mine plans and assay sheets into a ranked target list. The tests of whether that list is any good come in sequence: ground geophysics and structural mapping to define the untested strike and depth extensions; underground rehabilitation and re-sampling of the historical workings to verify the old assays with modern QA/QC; and then drilling designed to establish whether the oreshoots repeat at depth.

Investors should watch for three specific disclosures. First, a stated exploration budget and funding source — whether QEM funds Big It from existing cash, from a raise, or with a partner. Second, any move toward a maiden JORC-compliant resource, which is the gate between an interesting historical asset and something a strategic buyer or offtaker can underwrite. Third, whether the company pursues US federal or state support; the concentration figure it cites in its own announcement is the argument such applications are built on.

The market backdrop QEM is walking into

The announcement arrives with broad US equity benchmarks slightly softer. At the most recent close on Friday, 28 August 2026, the S&P 500 tracker (SPY) finished at $769.35, down 0.23% on the day from a previous close of $771.10, while the Nasdaq 100 proxy (QQQ) ended at $716.43, off 0.65%, and the Dow tracker (DIA) closed at $535.06, down 0.03%. None of that moves a junior explorer's fundamentals, but the risk appetite behind small-cap resource financings tends to track the broader tape, and QEM's ability to fund a drilling program on acceptable terms will depend on it.

The honest summary is that QEM has done the inexpensive work well and now faces the expensive part. Big It has a production record, documented high-grade metal in three commodities, existing underground access and a supply-chain narrative that governments are actively subsidising. What it does not yet have is a modern resource, a published budget or a drill result. Those are the numbers that will decide whether the expansion opportunities identified in this review become an asset or remain a file of historical reports.

Key facts

• Company and listing: QEM Limited, ASX: QEM
• Project: Big It, northern Idaho, USA — past producer of tungsten concentrates grading 67-75% WO3
• Best historical underground samples: Up to 2,980 ppm W, 19.5% Sb and 11.15 g/t Au
• Market backdrop (close, 28 Aug 2026, 20:00 GMT): SPY $769.35 (-0.23%); QQQ $716.43 (-0.65%); DIA $535.06 (-0.03%)

Frequently asked questions

What did QEM announce about the Big It project?

QEM Limited said it has completed a detailed review and compilation of available historical geological, mining and exploration information for the Big It Project in northern Idaho. The purpose was to identify early exploration targets and activities. The company says the work points to untested depth and strike potential and multiple high-grade tungsten oreshoots confirmed by earlier US Government exploration.

What grades did Big It historically produce?

Big It is a past producer of high-grade tungsten concentrates grading 67-75% WO3, which were supplied to United States wartime programmes. WO3 is tungsten trioxide, the standard form in which tungsten grade is reported. Separately, historical underground sampling returned individual values up to 2,980 ppm tungsten, 19.5% antimony and 11.15 g/t gold.

Why is tungsten considered a critical mineral?

Tungsten is used in cemented carbide cutting tools, drilling and mining bits, and defence applications, and it is very difficult to substitute in those uses. QEM notes that China still commands more than 80% of global supply, which leaves manufacturers in the US, Europe and Asia exposed to a single source of a metal with no straightforward chemical replacement.

Does Big It have a mineral resource estimate?

No. QEM's announcement describes a compilation of historical data and the identification of exploration targets, not a resource. The sample values cited are individual historical results from underground workings and do not establish continuity, width or tonnage. A maiden JORC-compliant resource would require modern drilling and verification sampling.

Why does existing underground development matter?

Extensive historical underground development means adits and drives already exist, giving access to mineralisation without building it first. QEM describes this as a clear, cost-effective pathway to test and expand the system. In practice it can shorten the time between spending and results, though old workings still need rehabilitation, ventilation and safety assessment before use.

What should investors watch next?

Three disclosures matter: a stated exploration budget and how it will be funded, progress toward a maiden compliant resource estimate, and any pursuit of US federal or state critical-minerals support. QEM has not published a budget or timetable for the next phase at Big It, so any assumption about the pace of drilling is speculation.

Sources

• Post Acquisition Review of Big It Tungsten Project Identifies Significant Expansion Opportunities — INN Battery Metals

Photo: Francesco Ungaro · Pexels Licence — source